Support HTTP basic auth credentials in export url
Support HTTP basic auth credentials in export url

Uses environment variables for username and password. Should only be
required short term while the site is not live and hence password
protected.

AstunTechnology/NRW_FishMapMon,AstunTechnology/NRW_FishMapMon,AstunTechnology/NRW_FishMapMon,AstunTechnology/NRW_FishMapMon